US 3,983,806 A · Hammer bank assembly

Abstract

A hammer bank assembly useful in high speed, moving type, impact printers of the kind generally employed in data processing systems. The assembly is comprised of a mounting structure supporting a plurality of aligned hammer modules and a plurality of aligned magnet modules. The mounting structure includes a rigid cylindrical tube and a plurality of fastening members disposed therealong. Each hammer module includes multiple hammers resiliently mounted on a common foot member. Each hammer is comprised of an impact tip carried on a rigid coil structure. Each hammer module foot member has a recess of substantially semicircular cross section dimensioned to conform to the periphery of the rigid tube. A plurality of identical hammer modules are mounted on the rigid tube with each foot member being secured to a different fastening member and with the tube engaging each foot member in the recess thereof. Each magnet module includes multiple permanent magnets rigidly mounted on a common foot member having a recess of substantially semicircular cross section, also dimensioned to conform to the tube periphery. A plurality of magnet modules are mounted on the rigid tube with the foot members thereof secured to said fastening members and with the magnets thereof interleaved with said hammers so that each hammer coil structure is disposed in a permanent magnet field. Energization of the coil develops a force on the coil structure to propel the hammer toward the moving type surface. Each magnet module also includes multiple adjustable backstops, each for bearing against and establishing the rest position of a hammer.

Claims13

Dependent claims

A hammer bank assembly useful in high speed impact printers, said assembly comprising:

mounting means including a first elongated member of substantially uniform cross section;
a plurality of fastening members affixed along said elongated member;
a plurality of hammer modules, each including a foot member and a hammer supported on said foot member for movement with respect thereto, each of said hammer module foot members defining an open recess therein of a shape and dimension conforming to a portion of the cross sectional periphery of said elongated member;
a plurality of magnet modules, each including a foot member and a magnet member supported on said foot member, each of said magnet module foot members defining an open recess therein of a shape and dimension conforming to a portion of the cross sectional periphery of said elongated member;
means fixedly securing each of said plurality of hammer modules to a different one of said fastening members at a different position along said elongated member with said portion of the cross-sectional periphery of said elongated member engaging said hammer module foot members in the recesses thereof;
and
means fixedly securing each of said plurality of magnet modules to a different one of said fastening members at a different position along said elongated member with said portion of the cross-sectional periphery of said elongated member engaging said magnet module foot members in the recesses thereof and with said magnet members interleaved with said hammers.

4 more elements

An impact printer including:

1. a movable type-bearing surface;
2. a hammer bank assembly mounted adjacent to said type bearing surface, said assembly comprising:
a. mounting means including a first elongated member of substantially uniform cross section;
b. a plurality of fastening members affixed along said elongated member;
c. a plurality of hammer modules, each including a foot member and a hammer supported on said foot member for movement with respect thereto, each of said hammer module foot members defining an open recess therein of a shape and dimension conforming to a portion of the cross-sectional periphery of said elongated member;
d. a plurality of magnet modules, each including a foot member and a magnet member supported on said foot member, each of said magnet module foot members defining an open recess therein of a shape and dimension conforming to a portion of the cross-sectional periphery of said elongated member;
e. means fixedly securing each of said plurality of hammer modules to a different one of said fastening members at a different position along said elongated member with said portion of said cross-sectional periphery of said elongated member engaging said hammer module foot members in the recesses thereof;
and
f. means fixedly securing each of said plurality of magnet modules to said elongated member at a different position along said elongated member with said portion of said cross-sectional periphery of said elongated member engaging said magnet module foot members in the recesses thereof and with said magnet members interleaved with said hammers;
and
3. means for moving paper between said type bearing surface and said hammer bank assembly.

8 more elements

Dependencies are inferred from the claim text.

Hammer bank assembly

Life of this patent

Hammer bank assembly

Life of this patent

Abstract

Claims13